Facebook is adding support for hashtags to help its members keep track of popular topics being discussed on the social network,
Adding the "#" sign to a word will turn it into a clickable link which brings up a feed of what other people are saying about the same topic.
Using hashtags to identify a theme was popularised on the internet by Twitter.
Facebook said it offers a "larger view of what's happening". Experts said it might also aid ad sales.
Other services that support hashtags include Pinterest, Tumblr, Google+, Sina Weibo, LinkedIn and Instagram, which is owned by Facebook.
